<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        a{
            display: inline-block;
            width: 120px;
            height: 58px;
            /* background-color: gold; */
            text-align: center;
            line-height: 58px;
            color: #fff;
            text-decoration: none;
        }
        .item1{ background-image: url(./images/bg1.png); }
        .item2{ background-image: url(./images/bg2.png); }
        .item3{ background-image: url(./images/bg3.png); }
        .item4{ background-image: url(./images/bg4.png); }

        .item1:hover{ background-image: url(./images/bg4.png); }
        .item2:hover{ background-image: url(./images/bg3.png); }
        .item3:hover{ background-image: url(./images/bg2.png); }
        .item4:hover{ background-image: url(./images/bg1.png); }
    </style>
</head>
<body>
    
    <a href="#" class="item1">五彩导航</a>
    <a href="#" class="item2">五彩导航</a>
    <a href="#" class="item3">五彩导航</a>
    <a href="#" class="item4">五彩导航</a>

</body>
</html>